ClickFont allows easy font installation from anywhere in the system. The all new beta version supports TrueType, OpenType and PostScript fonts. You can download it from the tools page.

Lots of new features to restore deleted items and some minor bugfixes coming to the all new version. The Czech translation had to be removed temporarily, but should be back in 0.10.8/0.2.8 - most likely the last in this branch.